Primary is a bit of an odd one..everyones going to think Im a freak but here we go
Some girls tooth fell out at school. She was told to put it in her drawer until she went home. I stole the tooth and tried to pretend to my mum that it was mine, as I wanted money off the tooth fairy
Long story short, my mum obviously found out it wasnt mine, took me to the headteachers office the next day (where I stole a roll of stickers) and the head made me apologise to the girl and give her her tooth back
That night, armed with my roll of stickers I proceeded to tell my mum that I had been extremely good at school..too good for one sticker like usual, so the headteacher had given me the whole roll. Again, obviously she knew it was a lie, and I had to apologize to the headteacher the next day again.
I was grounded for a week at about 7 year old...
Secondry..I really dont know. Take your pick between refusing not to smoke in the yard. Drinking at school. Putting ketchup in my teachers shoes. Skiving. Removing the school firewall so that everyone could go on what they liked on the computers, and adding salt to a girls cake in cooking class.